Table 1.

Summary of the average blank corrected amino acid concentrations in the hot water extracts of the Martian meteorite Nakhla and of the Nile Delta sediment as measured by two separate analyses, one at SIO and the other at JPL

Water extract*	d-Asp	l-Asp	d-Ser	l-Ser	d-Glu	l-Glu	Gly	β-Ala	d-Ala	l-Ala	γ-ABA	AIB
Nakhla
Free	<2  ±  1	<2  ±  1	2  ±  1	16  ±  11	<2  ±  1	1  ±  1	43  ±  16	14  ±  2	<1  ±  1	33  ±  19	4  ±  3	<1  ±  1†
Total	23  ±  7	63  ±  12	21  ±  13	81  ±  35	44  ±  9	278  ±  7	327  ±  1	100  ±  15	18  ±  12	55  ±  11	99  ±  11	<1  ±  1†
Nile Delta
Free	30  ±  21	293  ±  114	23  ±  15	123  ±  1	26  ±  18	83  ±  58	488  ±  84	187  ±  3	<1  ±  1	4  ±  1	8  ±  5	<1  ±  1†
Total	337  ±  43	781  ±  60	174  ±  50	430  ±  141	298  ±  2	1,013  ±  143	2,168  ±  73	598  ±  142	256  ±  22	782  ±  59	205  ±  10	<1  ±  1†

All values are reported in parts per billion (ppb) on a bulk sample basis. The uncertainties are based on the SD of the average value of the two separate measurements. 

^*Free indicates amino acids in an unhydrolyzed sample. Total (free + bound) indicates amino acids in a sample hydrolyzed by 6 M HCl. 

^†Derivatization for 15 min.